L6739TR

DC DC Switching Controllers Overview

The L6739TR is a single-phase step-down PWM controller manufactured by STMicroelectronics, designed for DC-DC converter applications. It features integrated high-current drivers and complete control logic with protection mechanisms. The device supports a flexible power supply input ranging from 5 V to 12 V bus voltage, while managing power conversion inputs as low as 1.5 V. Key electrical parameters include an internal 0.8 V reference with ±0.5% output voltage accuracy over line and temperature variations. The oscillator is programmable up to 600 kHz, enabling efficient operation. It includes sensorless overcurrent protection monitored across the inductor DCR, overvoltage protection, and overtemperature protection. The component operates within a junction temperature range of -40°C to +125°C and is housed in a compact VFQFPN 16 package measuring 3 x 3 mm.

DC DC Switching Controllers Feature Summary

• Proprietary algorithm for light-load efficiency optimization that boosts efficiency without compromising output voltage ripple.
• Integrated high-current drivers providing complete control logic and protection for realizing DC-DC converters.
• Sensorless and programmable precise overcurrent sensing across the inductor DCR combined with overvoltage and overtemperature protection.

DC DC Switching Controllers Applications

• Single-phase step-down DC-DC converter implementations
• Systems requiring light-load efficiency optimization
• Applications needing programmable switching frequencies up to 600 kHz

DC DC Switching Controllers Procurement Notes

Verify the specific suffix 'TR' indicates the reel packaging format when ordering. Confirm the component status as obsolete or end-of-life through official STMicroelectronics channels prior to design finalization. Ensure compatibility with the required 5 V to 12 V bus supply and 1.5 V minimum input voltage constraints. Validate that the VFQFPN 16 (3x3 mm) footprint aligns with the PCB layout specifications. Check for any pending Product Change Notices affecting manufacturing or qualification data.

DC DC Switching Controllers Selection Notes

Select this controller for designs prioritizing light-load efficiency and flexible input voltage ranges down to 1.5 V. It is suitable for applications requiring programmable switching frequencies up to 600 kHz and precise output voltage regulation with ±0.5% accuracy. Consider the integrated high-current drivers and comprehensive protection features, including DCR-based current sensing and thermal shutdown. Evaluate the compact 3x3 mm VFQFPN 16 package against available board space. Note that the device is listed as obsolete, which may impact long-term availability and support.

DC DC Switching Controllers Part Context

The L6739 belongs to STMicroelectronics' portfolio of single-phase PWM controllers, specifically engineered for buck converter topologies. It distinguishes itself through integrated high-current drivers and advanced light-load efficiency optimization algorithms. The device provides robust protection features such as overcurrent, overvoltage, and overtemperature safeguards, making it suitable for reliable DC-DC conversion. It operates within a wide temperature range and utilizes a compact surface-mount package for space-constrained designs.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Verify alternative components directly with STMicroelectronics or authorized distributors due to the obsolete status of the L6739 series.